<template>
    <div>
        <!--面包屑导航-->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--警告区域-->
        <el-card>
              <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
        </el-alert>

        <!--选择商品分类区域-->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!--选择商品分类的级联选择框-->
                <el-cascader expand-trigger='hover' v-model="selectedCateKeys" :options="catelist" :props="cateProps"
                        @change="handleChange" clearable>
                </el-cascader>
            </el-col>
        </el-row>
        <!--tab页签区域-->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
            <!--添加动态参数的面板-->
            <el-tab-pane label="动态参数" name="many">
                <!--添加参数的按钮-->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                <!--动态参数表格-->
                <el-table :data="manyTableData" border stripe>
                    <!--展开行-->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                        <!--循环输出标签-->
                            <el-tag closable v-for="(item ,i) in scope.row.attr_vals" :key="i" @close="handleClosed(i,row)">{{item}}</el-tag>
                        <!--输入的文本框-->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!--添加按钮-->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!--索引列-->
                    <el-table-column type='index'></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="primary" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
            <!--添加静态属性的面板-->
            <el-tab-pane label="静态属性" name="only">
                <!--添加属性的按钮-->
                <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                <!--静态属性表格-->
                <el-table :data="onlyTableData" border stripe>
                    <!--展开行-->
                    <el-table-column type="expand">
                        <template slot-scope="scope">
                        <!--循环输出标签-->
                            <el-tag closable v-for="(item ,i) in scope.row.attr_vals" :key="i" @close="handleClosed(i,row)">{{item}}</el-tag>
                        <!--输入的文本框-->
                            <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                            </el-input>
                            <!--添加按钮-->
                            <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                        </template>
                    </el-table-column>
                    <!--索引列-->
                    <el-table-column type='index'></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="primary" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
        </el-card>
        <!--添加参数的对话框-->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="att_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!--修改参数的对话框-->
         <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="att_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            //级联选择框双向绑定的数组
            selectedCateKeys:[],
            //被激活的页签名称
            activeName: 'many',

            //动态数据对象
            manyTableData:[],
            //静态数据对象
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible: false,
            //添加参数的表单数据对象
            addForm:{
                attr_name:'',
                attr_sel:'',
            },
            //添加参数的表单数据验证规则对象
            addFormRules:{
                attr_name:[
                    {required: true, message:"请输入参数名称", trigger:'blur'}
                ]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible: false,
            //修改参数的表单数据对象
            editForm:{ },
            //修改参数的表单数据验证规则对象
            editFormRules:{
                attr_name:[
                    {required: true, message:"请输入参数名称", trigger:'blur'}
                ]
            },
            inputVisible: false,
            inputValue: '',
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取所有的商品分类
        async getCateList(){
            const {data:res} =await this.$http.get('categories')
                if(res.meta.status !== 200){
                    return this.$message.error("获取所有商品分类失败")
                }
                this.catelist = res.data
            //console.log(this.catelist)
        },
        //级联选择框选中项变化，会触发这个函数

        handleChange(){
           this.getParamsData()
        },

        //tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
        },
        //获取参数的列表数据
        async getParamsData(){
            //证明选中的不是三级分类
             if(this.selectedCateKeys.length !==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //根据所选分类的ID，和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}
            })
            if(res.meta.status !== 200){
                return this.$message.error("获取参数失败")
            }
            //console.log(res.data)

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏
                item.inputVisible = false
                //文本框中输入的值
                item.inputValue = ''
            });
            console.log(res.data)
            if(this.activeName == "many"){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        //监听添加对话框的关闭
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮，添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,{attr_name: this.addForm.attr_name, attr_sel: this.activeName})
                if (res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        //点击按钮，修改参数
        async showEditDialog(attr_id){
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {
                params: {attr_sel: this.activeName }
            })

            if(res.meta.status !== 200){
                return this.$message.error("获取参数信息失败！")
            }
             this.editForm = res.data
            this.editDialogVisible = true
        },

        //重置修改的表单对象
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮，修改参数
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return
                const {data: res} = await this.$http.put(
                    `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })

                if(res.meta.status !==200){
                    return this.$message.error('修改参数失败！')
                }

                this.$message.success('修改参数成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        //点击按钮，删除参数
        async removeParams(attr_id){
            const confirmResult = await this.$confirm(
                '此操作将永久删除该文件, 是否继续?', 
                '提示', 
                    {
                        confirmButtonText: '确定',
                        cancelButtonText: '取消',
                        type: 'warning'
                    }
                ).catch( err => err)
            //console.log(confirmResult)
            //用户取消了删除操作
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除操作')
            }

            //删除的业务逻辑
            const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            
            if(res.meta.status !== 200){
                return this.$message.error("删除操作失败")
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        //文本框失去焦点，或摁下了ENter都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())

            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存这次操作
            this.saveAttrVals(row)
        },
        //将对attrVals的操作保存到数据库
        async saveAttrVals(row){
            // 需要发起请求，保存这次操作
            const {data:res} =  await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
                attr_vals: row.attr_vals.join(' '),
                attr_sel: row.attr_sel,
                attr_name: row.attr_name
            })

            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        //点击按钮，展示文本输入框
        showInput(row){
            row.inputVisible = true
            //让文本框自动获得焦点
            //$nextTick方法的作用：就是当页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        //删除对应的参数可选项
        handleClosed(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
     },
    computed:{
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        //当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length == 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName === "many"){
                return '动态参数'
            }
            return '静态属性'
        },
        
    },
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0px;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 100px;
}
</style>